Dust in a car builds up faster than in a house, which surprises a lot of people. Wiping the dash helps for a day or two, then it's back. The reason is usually less about how often you clean and more about where the dust is actually coming from.
Fabric and vents are doing most of the work
Fabric seats, floor mats, and carpet all shed fine particles constantly, and the HVAC system recirculates cabin air — including whatever dust is already loose — every time it runs. Wiping visible surfaces doesn't touch either source.
Surface wiping vs. actually removing it
A cloth mostly relocates dust rather than removing it, especially on textured surfaces like vents and seams. That's why the dash looks clean right after wiping but hazy again within days — the dust that was in the fabric and crevices wasn't going anywhere.
Vacuuming is the part people skip
A proper cabin vacuum pulls dust out of the fabric and carpet instead of just moving it around. A cordless car vacuum makes this realistic to do regularly, since it doesn't require dragging out a shop vac or driving to a car wash vacuum station.
Don't forget the vents themselves
Dust that collects right at the vent louvers gets blown back into the cabin every time the AC or heat kicks on. A quick pass with a narrow vacuum attachment or a soft brush there makes a bigger difference than people expect.
A realistic routine
Vacuum seats, mats, and vents every couple of weeks, and wipe hard surfaces after — not before. Doing it in that order means you're not just spreading dust the vacuum could've caught. For more on keeping the rest of the interior in check, see our 10-minute detail routine.